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216 lines
4.1 KiB
216 lines
4.1 KiB
4 months ago
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test that a signal handler that uses up stack space does not crash
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// if the signal is delivered to a thread running a goroutine.
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// This is a lot like misc/cgo/testcarchive/main2.c.
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#include <setjmp.h>
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#include <signal.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <sched.h>
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#include <time.h>
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#include <dlfcn.h>
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static void die(const char* msg) {
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perror(msg);
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exit(EXIT_FAILURE);
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}
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static volatile sig_atomic_t sigioSeen;
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// Use up some stack space.
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static void recur(int i, char *p) {
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char a[1024];
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*p = '\0';
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if (i > 0) {
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recur(i - 1, a);
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}
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}
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// Signal handler that uses up more stack space than a goroutine will have.
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static void ioHandler(int signo, siginfo_t* info, void* ctxt) {
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char a[1024];
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recur(4, a);
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sigioSeen = 1;
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}
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static jmp_buf jmp;
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static char* nullPointer;
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// Signal handler for SIGSEGV on a C thread.
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static void segvHandler(int signo, siginfo_t* info, void* ctxt) {
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sigset_t mask;
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int i;
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if (sigemptyset(&mask) < 0) {
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die("sigemptyset");
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}
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if (sigaddset(&mask, SIGSEGV) < 0) {
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die("sigaddset");
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}
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i = sigprocmask(SIG_UNBLOCK, &mask, NULL);
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if (i != 0) {
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fprintf(stderr, "sigprocmask: %s\n", strerror(i));
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exit(EXIT_FAILURE);
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}
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// Don't try this at home.
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longjmp(jmp, signo);
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// We should never get here.
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abort();
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}
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int main(int argc, char** argv) {
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int verbose;
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struct sigaction sa;
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void* handle;
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void (*fn)(void);
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sigset_t mask;
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int i;
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struct timespec ts;
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verbose = argc > 2;
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setvbuf(stdout, NULL, _IONBF, 0);
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// Call setsid so that we can use kill(0, SIGIO) below.
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// Don't check the return value so that this works both from
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// a job control shell and from a shell script.
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setsid();
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if (verbose) {
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printf("calling sigaction\n");
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}
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memset(&sa, 0, sizeof sa);
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sa.sa_sigaction = ioHandler;
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if (sigemptyset(&sa.sa_mask) < 0) {
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die("sigemptyset");
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}
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sa.sa_flags = SA_SIGINFO;
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if (sigaction(SIGIO, &sa, NULL) < 0) {
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die("sigaction");
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}
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sa.sa_sigaction = segvHandler;
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if (sigaction(SIGSEGV, &sa, NULL) < 0 || sigaction(SIGBUS, &sa, NULL) < 0) {
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die("sigaction");
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}
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if (verbose) {
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printf("calling dlopen\n");
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}
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handle = dlopen(argv[1], RTLD_NOW | RTLD_GLOBAL);
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if (handle == NULL) {
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fprintf(stderr, "%s\n", dlerror());
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exit(EXIT_FAILURE);
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}
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if (verbose) {
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printf("calling dlsym\n");
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}
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// Start some goroutines.
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fn = (void(*)(void))dlsym(handle, "RunGoroutines");
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if (fn == NULL) {
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fprintf(stderr, "%s\n", dlerror());
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exit(EXIT_FAILURE);
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}
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if (verbose) {
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printf("calling RunGoroutines\n");
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}
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fn();
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// Block SIGIO in this thread to make it more likely that it
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// will be delivered to a goroutine.
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if (verbose) {
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printf("calling pthread_sigmask\n");
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}
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if (sigemptyset(&mask) < 0) {
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die("sigemptyset");
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}
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if (sigaddset(&mask, SIGIO) < 0) {
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die("sigaddset");
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}
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i = pthread_sigmask(SIG_BLOCK, &mask, NULL);
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if (i != 0) {
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fprintf(stderr, "pthread_sigmask: %s\n", strerror(i));
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exit(EXIT_FAILURE);
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}
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if (verbose) {
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printf("calling kill\n");
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}
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if (kill(0, SIGIO) < 0) {
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die("kill");
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}
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if (verbose) {
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printf("waiting for sigioSeen\n");
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}
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// Wait until the signal has been delivered.
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i = 0;
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while (!sigioSeen) {
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ts.tv_sec = 0;
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ts.tv_nsec = 1000000;
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nanosleep(&ts, NULL);
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i++;
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if (i > 5000) {
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fprintf(stderr, "looping too long waiting for signal\n");
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exit(EXIT_FAILURE);
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}
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}
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if (verbose) {
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printf("calling setjmp\n");
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}
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// Test that a SIGSEGV on this thread is delivered to us.
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if (setjmp(jmp) == 0) {
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if (verbose) {
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printf("triggering SIGSEGV\n");
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}
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*nullPointer = '\0';
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fprintf(stderr, "continued after address error\n");
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exit(EXIT_FAILURE);
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}
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if (verbose) {
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printf("calling dlsym\n");
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}
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// Make sure that a SIGSEGV in Go causes a run-time panic.
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fn = (void (*)(void))dlsym(handle, "TestSEGV");
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if (fn == NULL) {
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fprintf(stderr, "%s\n", dlerror());
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exit(EXIT_FAILURE);
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}
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if (verbose) {
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printf("calling TestSEGV\n");
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}
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fn();
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printf("PASS\n");
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return 0;
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}
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